Atoms and molecules

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Across
  1. 2. Arrangement and components of an atom.
  2. 7. Early atomic theory proposing indivisible atoms.
  3. 9. Mass of an atom, primarily from protons and neutrons.
  4. 10. Number of particles in one mole of a substance (6.022 x 10^23).
  5. 14. Numbers describing properties of atomic orbitals.
  6. 17. Model describing electrons in circular orbits.
  7. 18. Table organizing elements by increasing atomic number.
  8. 21. Concept connecting mass, particles, and Avogadro's number.
  9. 22. Bond formed by the transfer of electrons.
  10. 24. Specific energy state of an electron in an atom.
  11. 25. Region in space where electrons are most likely to be found.
  12. 27. Representation of chemical reactions using symbols.
  13. 28. Number of protons in the nucleus of an atom.
  14. 29. Particles making up an atom (protons, neutrons, electrons).
  15. 30. Outer electron shell that determines chemical bonding.
Down
  1. 1. Central part of an atom containing protons and neutrons.
  2. 3. Subatomic particles within the nucleus.
  3. 4. Distribution of electrons in atomic orbitals.
  4. 5. Theoretical representation of atoms.
  5. 6. Total number of protons and neutrons in an atom.
  6. 8. Model describing the nucleus and its discovery.
  7. 11. Model proposing the 'plum pudding' structure of the atom.
  8. 12. Simplest whole-number ratio of elements in a compound.
  9. 13. Force holding atoms together in a compound.
  10. 15. Process involving rearrangement of atoms into new substances.
  11. 16. Variants of elements with different neutron numbers.
  12. 19. Region around the nucleus where electrons are likely found.
  13. 20. Formula showing exact number of atoms in a molecule.
  14. 23. Chemical bond involving shared electron pairs.
  15. 26. Pathway or orbit of electrons around the nucleus.